Pumping-jack.



No.794,546. PATENTEDJULY-11,1905. G.PITGHER.

PUMPING JACK.

APPLICATION FILED NOV. 14, 1904.

2 SHEETS-SHEET'L PATENTED JULY 11, 1905.

G. PITGHER.

PUMPING JACK.

APPLICATION FILED NOV.14, 1904.

2 SHEETS-SHEET 2.

UNITED STATES Patented July 11, 1905.

PATENT ,OEErcE.

PUMPING-JACK- SPECIFICATION forming part of Letters Patent No. 794,546, dated July 11, 1905.

Application filed November 14, 1904. Serial No. 232,653.

I!) all whom it may concern:

Be it known that I, GEORGE PI'roHER, a citizen of the United States of America, residing at Montpelier, in the county of Blackford and State of Indiana, have invented certain new and useful Improvements in Pumping-Jacks, of which the following is such a full, clear, and exact description as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming a part hereof.

This invention relates to improvements in pumping-jacks for oil and other wells; and it consists in certain novel features of the apparatus illustrated in the accompanying drawings, which will be hereinafter first fully described and then particularly pointed out in the claims, the object of the invention being to provide an apparatus of an inexpensive but durable construction which will be efiieient in operation. I

In the drawings, Figure 1 isa side elevation of a pumping-jack embodying the invention. Fig. 2 is an end elevation of the same. Fig. 3 is a detail perspective view of the jack fulcrum or bearing. Fig. 4: is a detail section of the same. Fig. 5 is a detail view of the pivotal support of the pony or walking beam, and Fig. 6 is a detail view of the connection between the jack and the pull-rod.

In carrying out my invention I employ a base or sill 1, which is set on the ground adjacent to the well. The Samson-post 2 rises from the sill near. the end farther away from the well and consists of two timbers bolted to the opposite sides of the sill and braced by diagonals 3, secured to the sill and the upper ends of the timbers, as shown. Between the upper ends of the timbers is fitted a box 4:, carrying a central horizontal pivot or fulcrum pin 5, the ends of which engage suitable openings or sockets in the timbers. The upper end of the samson-post thus supports the fulcrum-pin, while the box 1 serves to hold the pony or walking beam 6 in the proper position for the easy operation of the apparatus, the sides of the box tending to prevent lateral vibration of'the beam and the top and bottom of the box acting as stops to limit the vertical vibration of the same, so that binding and consequent blocking of the beam cannot occur. The beam is composed of two members bolted together, and between the free ends of the members the polish-rod 7 passes and plays, the said rod being formed with trunnions 8,

which are journaled in suitable bearings 9 on the upper edges of the members of the walking-beam, as clearly shown. Near the said trunnions and bearingsI pivotally secure to the beam a pitman 10, the lower end of which ispivotally attached to one end of the jack proper by links 11, secured to the opposite sides of the pitman and passing down to and mounted on a pivot pin or bolt 12 in the end of the jack. The lower end of this pitman is convex, so that it may easily and effectually clear thejack in the operation of the apparatus.

The jack proper consists of a bar 13, mounted on the upper end of a post 14 and reinforced by diagonal braces 15, as will be readily understood. The lower ends of the post 14: and the braces 15 are fitted and secured to a base-block 16, and on the under side of this base-block is a fulcrum or journal 'plate 17,

which is rigidly secured in position and is provided with vertical flanges 18 at its sides, which engage the opposite sides of the baseblock, and thereby prevent twisting of the plate. On its under side the plate is provided with a central transverse bearing or fulcrum rib or trunnion 19, which rests in a concave groove 20, formed in the upper side of the bearing-plate 21, which is secured on the upper side of the sill. This bearing-plate is provided with a vertical oil-retaining flange 22 along its entire edge, and adjacent to the groove 20, at the side of the same farther away from the polish-rod, lugs 23 are formed on the upper side of the plate, the said lugs preventing the fulcrum-rib from riding upward and backward out of the groove when the device is in operation.

At the end of the bar 13 opposite the pitman 10 I pivotally attach to the sides of the bar the straps or plates 24, the ends of which are secured to the ends of a block 25, formed on the end of the pull-rod 26, which passes between the members of the Samson-post to a horse-power or other driving mechanism; As

the driving mechanism forms no part of the present invention I have not illustrated the same in the drawings.

The operation of the device will be readily understood. Motion is imparted to the pullrod by the driving mechanism and the jack is thereby vibrated in a vertical plane, alternately pulling down and pushing up the pitman 10, which in turn oscillates the walking or pony beam. The polish-rod being connected directly to the said beam is carried up and down by the same, so as to transmit the proper movement to the pump-rod.

The device is very simple and inexpensive in its construction and operates very smoothly and easily. The arrangement and pivotal connections of the several parts are such that freedom of movement is provided and binding is prevented, while the power is transmitted without loss to the polish-rod. The bearing-plate is covered with lubricant to the level of the oil-retaining flange thereon, and the fulcrum is consequently caused to work in a lubricant, which may be readily replenished ported by said post, and stops above and below the beam.

3. The combination of the sill, a-bearingplate secured on the upper side of the sill and having on its upper face a transverse groove, a stop adjacent to said groove and an oil-retaining flange extending along all the edges of the plate beyond said groove and stop, a jack, a fulcrum-plate secured to the lower end of the jack and having a transverse rib on its under side resting in the groove in the bearingplate, a polish-rod, connections between the polish-rod and the jack, and means for vibrating the jack.

4:. The improved pumping-jack comprising a sill, a Samson-post, a walking-beam having one end fulcrumed upon the samson-post, a polish-rod connected to the free end of the walking-beam, a jack comprising a central post, a cross-bar on the upper end of the post and extending to opposite sides of the same, a base-block at the lower end of the post fulcrumed on the sill, and braces between said cross-bar and base-block, straps pivotally secured to one end of the cross-bar, a pitman secured between said straps and connecting the jack with the walking-beam, and a pullrod pivoted to the opposite end of the crossbar.

In testimony whereof I have signed this specification in the presence of two subscribing Witnesses.

GEORGE PITCHER.

Witnesses:

JOHN EMsHwILLER, ROBERT M. EMSHWILLER. 

